Unbeaten Princeton overpowered Yale 35-14 Saturday, winning the Ivy League championship and denying Harvard one last chance to affect the title race.

The Tigers (8-0), riding a second-half explosion by Cosmo Iacavazzi, subdued the Elis (6-1-1) and clinched the championship that they had to share last year with Dartmouth. Next week's Harvard-Yale game became meaningless, as far as the Ivy League title is concerned.

Iacavazzi amassed a team-sized total of 185 yards rushing in 20 carries, but his achievement accounted for little more than half of Princeton's gargantuan rushing figure of 354 yards.

Elis Score Early

Up to halftime, the game had been close. Yale, sparked by Ed McCarthy's passing, battled the Tigers to a 14-14 dead-lock, confining Iacavazzi to only 23 yards in 10 tries. The Bulldogs scored the first time they had the ball, Chuck Mercein's one-yard plunge capping a drive which consisted chiefly of a 61-yard pass play from McCarthy to end Bunky Carter.

But Princeton came back quickly in the second quarter to score twice under the leadership of alternating tailbacks Don McKay and Ron Landek. Yale tied the score when McCarthy completed a rapid 64-yard march by passing seven yards to Bill Henderson in the end zone.

Then, in the last period, Iacavazzi decided the issue once and for all with two touchdown runs, the first 39 yards after Yale had fumbled, and the second a big 47 yards.

Mercein, the Elis' leading rusher and kicker, pulled a hamstring muscle reaching for a pass, and is now in the Yale infirmary.